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Finding the Fourth Proportional to 1,257.32, 1,884.84 and 679.52

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Solution

The fourth proportional to 1,257.32, 1,884.84 and 679.52 is: 1,018.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.32 : 1,884.84 = 679.52 : x
  2. Step 2: Convert to fraction form
    1,257.32/1,884.84 = 679.52/x
  3. Step 3: Cross multiply
    1,257.32x = 1,884.84 × 679.52
  4. Step 4: Simplify right side
    1,257.32x = 1,280,786.48
  5. Step 5: Solve for x
    x = 1,280,786.48/1,257.32
  6. Step 6: Final answer
    x = 1,018.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.